Sorting screen



July 29, 1 930. c. C. LARSEN 1,

SORTING SCREEN Filed June 20. 1929 INYENTOR:

L Niamey.

Patented I July 29, 1930 UNITED STATES PATENT OF CARL CHRISTIAN Lassen,

or COPENHAGEN, nnnM nK son'rrne SCREEN Application filed June 20, 1929. Serial a,

The present invention relates to sorting screens of the kind using co-axial discs rotating on a plurality of parallel shafts, and is mainly characterized in that the discs on consecutive shafts are displaced relatively to each other in such a manner that the discs on one shaft, in the intervals between the discs on the adjoining shafts, will reach near- 29 is illustrated on the drawing, where vFig. .1 shows a portion of the screen in side elevation with the limiting side wall removed,

Fig.2 a partial verticalcross-Section of a portion of the screen, and r Fig. 3 a detail.

The screen is supportedby girders-l which not; shown manner support limiting side plates2 and on which supportingwbearings 39 4 are provided for the mutually parallel shafts 3 which outside of one of the limiting plates 2 support'overhanging sprocket wheels 6,

i which in not further detailed-manner are all maintained in synchronous rotation. Onthe shafts-fixed discs 7 are discs 8 between the former. V

In the construction shownthesediscs are shaped as equilateral triangles and'are disposed in sucha manner on each shaft that their edges are all mutually parallel. The discs on any two adjacent shafts, on the other hand, are turned about'15 relatively to each other, as shown by Fig. 1,.so that the corners do not pass the horizontal planesimultaneously. The discs, are further staggered relatively to each other, and are of such a size that the points on one disc can nearly reach both neighbouring shafts, each disc projecting, into" the space between two of the discs provided on each of these' shafts.

provided and sliding 372,362, and in Denmark November 2,1928; 7

By giving the discs this shape and dispos 1ng them in this manner various advantages are attained Which-are of importance to the operation of the sortingscreen. The ad vantage is attained, for instance, that pieces of the material to be. sorted, which during the work become pinched between twondjamatically be struck looseby the neighbouring disc engaging the space between the. two discs concerned, so th'atany clogging of the screen is entirely precluded. 'ThenftherelaE a good transport 'to be. sorted. By, turning the discs onitwo. consecutiveshaft's tively sharp corners have ing effect on the materialv about l5 relatively to eachothera wavelike motion of thematerial is attained, so that cent discs willinstan'taneously and autonotthe entire material has to belifted at a ti'me,'whereby theoperation of the sorter 7 would becomequite irregular, and at the same time the advantage is attained that" the angle A between the edges of consecutive discs will be larger, so that any pinching effect between these sides will be better avoided than if these angles were smaller. i In the construction are fitted with a bore 16 for a sliding rod 17 the free end of which projecting beyond the shaft 3 is threaded. The threaded end of the'rod 17 supports a handwheel 18. fitted with an interiorgroove 19 engaging aflange 20 on the end of the shaft 3, in such amanthe fixed discs 7 and the sliding discs 8. The

bars 24 pass smoothly through holesin the hubs 25 of the fixed discs, but in a manner not shown in detail they are connected to the hubs 26 of the sliding discs,'so that the latter will follow the motion of the bars 24.

ner that thehand-wheel may be turned rela shown the shafts 3 I are mainly solid, although at one end they a locking device is not shownon the draw parallel shafts,

The adjusting device acts in the following manner: I 7 a When the hand-Wheel 18 is turned on the end of the shaft 3 then the rod 17 and, thereby, the ring 23 will be displaced in axial direction relatively to the shaft 3. Herebythe bars 2a and the sliding discs 8 will also be displaced axially, in' such a manner that the space b between a sliding disc 8 and a fixed disc 7 may be reduced from the size shown in Fig. 2 to the sizea which is producedwhen the sliding disc, as indicated by dotted lines in the figure, is situated midways between two consecutive fixed discs/7.

By this adjusting device the advantage is attained that the size of grain of the'screened material may be varied inside of certain limits.

, It is preferable to be able to lock the-hand- Wheel 18 relatively to the shaft 3, in such a manner that no undesired mutual rotation of these parts may occur accidentally. Such hat Iclain as new is: Sorting screen comprising a plurality of supportingco-axial fixed and movable discs longitudinally of the shafts in alternate successiony's'aid discs displacedini such amanner relatively to each other that the discs on one shaft, in the space between the discs on the neighbouring shafts can extend nearly up to said shafts and means for simultaneously adjusting the movable discs longitudinally on their shafts. y

In testimony whereof I affix'my si nature.

7 CARL CHRISTIAN LAR 

